diff --git a/scheduled_host_transition.cpp b/scheduled_host_transition.cpp
index 6329a93..06035aa 100644
--- a/scheduled_host_transition.cpp
+++ b/scheduled_host_transition.cpp
@@ -245,7 +245,7 @@
             return true;
         }
     }
-    catch (std::exception& e)
+    catch (const std::exception& e)
     {
         error("deserialize exception: {ERROR}", "ERROR", e);
         fs::remove(path);